Discussions about the Bose S1 Pro system

Bose S1 Pro

Designed for musicians, DJs and general PA use, the S1 Pro is the ultimate all-in-one PA, floor monitor and practice amplifier that's ready to be your go-anywhere Bluetooth music system for nearly any occasion. 

This is the place to discuss the S1 Pro system.

I have had my S1 Pro since the Summer. I use it for small gigs and for practice. I use  a Korg Krome DI and my guitars and bass guitar through the T1 Tonematch. My S1 has got  really rattly and "flappy" when low end sounds go through it . I never run it at top volume or push it that hard and I am careful to make sure it is not peaking more than occasionally. The roughness comes at fairly low volume. Does this sound like a fault? It really doesn't sound right to me. 

Original Post

Hi Phil C.

Welcome to the Bose Portable PA Community. I'm glad you're here.

I'm sorry you're getting rattly, flappy sounds from the S1 Pro.  Does this happen with pre-recorded music when you connect directly to the S1 Pro? (not through the T1).


Hi Phil C,

Phil C posted:

Hi. Thanks for replying. I haven't noticed it with recorded music but it definitely rattles when not via the Tonematch, ie when I DI an instrument. 

Do you mean the bass? Are you using a DI box?

If so, then

  • Try it without the DI
  • Try a different bass
  • Does it sound flappy with the Korg Krome?

Let's see if we can figure out where the problem lies.

You should NOT need to buy another piece of gear to solve this. It's a problem with certain frequencies, you can use the T1 to help with that.

But let's figure out the source of the problem first.


Thanks ST. 


The issue is there without the DI box when I use bass. I don't have another bass to hand to try so can't comment yet on your second question.

I do get the same issue with the Krome but only with certain lower end frequencies such as on a Hammond type organ sound for instance. 

I can see where your thinking might be going and I like it. Para eq on the T1?


Yes, @Phil C, the T1's Para EQ allows you to notch a frequency and it's bandwidth. Starting at 100Hz to 150Hz backing off the level a little at a time slowly increasing the octave width should help you notch out the offending frequency range, without detriment to your overall sound. I use active preamp DI boxes for quick adjustments, during gigs. Let us know how it works for you.

Hi Phil,

Let's do some more testing.

Connect the Bass to the T1.


  • First, try reducing the zEQ Low setting. If that doesn't help with the flappy, rattley sound, press the Low button to set it back to Bypass
  • Try the ParaEQ 

Here are notes on the ParaEQ 

On the channel you're using for the bass start with these settings.

See if that helps with the flappy, rattley sound.

It should.  If not, lower the level  to -15.0 dB

If that doesn't make a difference then we have to track down a different problem.

If it does help, then move the level back up until the bad sounds return.

When you've found a Level the improves the sound, fine tune, both the Level, and make the Width as narrow as possible, while still improving the sound.



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